{"product_id":"vivo-x80-replacement-battery-778v-2200mah-li-polymer","title":"Vivo X80 Replacement Battery B-U5 7.78V 2200mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eVivo X80 \/ V2183A \/ V2144 — 7.78V Li-Polymer Replacement Battery (B-U5)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.78V, 2200mAh Li-Polymer replacement battery for the Vivo X80 smartphone and its regional variants, V2183A and V2144. It replaces the original B-U5 cell when the factory battery has degraded, lost hold-charge capacity, or failed outright. Voltage and connector match the stock configuration — no modifications needed during installation.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eX80, V2183A, V2144 compatibility:\u003c\/strong\u003e\n    All three model numbers share the same battery bay geometry, connector pinout, and BMS handshake protocol. The B-U5 part number covers this entire variant group — same 7.78V dual-cell arrangement and NTC thermistor line.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through charge termination checks and BMS communication verification. The protection circuit responded correctly to overvoltage cutoff and temperature thresholds matched expected NTC readings throughout the cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first cycle:\u003c\/strong\u003e\n    After installation, disable fast charging and run one full discharge down to auto-shutdown, then charge to 100% on standard 5W. This gives the coulomb counter a clean reference curve against the new cell before the charge IC starts pushing high-current bursts into an uncalibrated cell.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% on the Vivo X80 after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens because the fuel gauge IC is still running a lookup table calibrated to the old, degraded cell. A new cell holds higher voltage across its mid-range, then drops steeply near depletion — the fuel gauge misreads that cliff as 20–30% remaining. Under modem load or display brightness spikes, the actual cell voltage dips below the system cutoff threshold before the percentage hits zero. One full discharge-charge cycle on standard charging rewrites the reference points the coulomb counter uses to map voltage to percentage.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eUSB-PD or proprietary fast charge not activating after replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eOn the first charge cycle after a cell swap, the charge IC may stay in trickle or standard mode rather than negotiating the fast-charge protocol. The BMS on a new cell starts with conservative current limits until it logs a completed cycle and confirms thermal behaviour is within spec. This is normal — it is not a fault with the replacement battery or the charger. Charge once fully at standard rate, then reconnect the fast charger; the protocol handshake should activate from the second cycle onward.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391837438042,"sku":"BWCS-BKX800SL-1","price":35.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391837470810,"sku":"BWCS-BKX800SL-2","price":41.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391837503578,"sku":"BWCS-BKX800SL-3","price":45.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BKX800SL-1.webp?v=1779142264","url":"https:\/\/batteryweb.com\/products\/vivo-x80-replacement-battery-778v-2200mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}